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macc: Stop using the B port

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The B port is for single-bit summands. These can just as well be
represented as an additional summand on the A port (which supports
summands of arbitrary width). An upcoming `$macc_v2` cell won't be
special-casing single-bit summands in any way.

In preparation, make the following changes:

 * remove the `bit_ports` field from the `Macc` helper (instead add any
   single-bit summands to `ports` next to other summands)

 * leave `B` empty on cells emitted from `Macc::to_cell`
This commit is contained in:
Martin Povišer 2024-12-13 18:10:10 +01:00 • committed by Emil J. Tywoniak
parent 8fd40942e9
commit 652a1b9806
10 changed files with 89 additions and 51 deletions
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2
passes/techmap/alumacc.cc
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@ -283,7 +283,7 @@ struct AlumaccWorker
for (auto &it : sig_macc)
{
auto n = it.second;
RTLIL::SigSpec A, B, C = n->macc.bit_ports;
RTLIL::SigSpec A, B, C;
bool a_signed = false, b_signed = false;
bool subtract_b = false;
alunode_t *alunode;